Cavity filter and connecting structure included therein

ABSTRACT

The present invention relates to a cavity filter. The cavity filter includes: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein the terminal portion is divided into a first side terminal contacted with the electrode pad and a second side terminal connected to the RF signal connecting portion, absorbs the assembly tolerance existing in a terminal insertion port, in which the terminal portion is provided, through an elastic member provided between the first side terminal and the second side terminal, and prevents disconnection of an electric flow, thereby preventing degradation in performance of an antenna device.

TECHNICAL FIELD

The present invention relates to a cavity filter and a connecting structure included therein, and more particularly, to a cavity filter for a massive MIMO (Multiple-Input Multiple-Output) antenna, which improves a connector fastening structure between a filter and a PCB (Printed Circuit Board) in consideration of assembly performance and size, and a connecting structure included therein.

BACKGROUND ART

The contents described in this section simply provide background information on the present disclosure, and do not constitute the related art.

MIMO (Multiple Input Multiple Output) refers to a technology capable of significantly increasing a data transmission capacity by using a plurality of antennas, and is a spatial multiplexing technique in which a transmitter transmits different data through respective transmitting antennas and a receiver sorts the transmitted data through a suitable signal processing operation. Therefore, when the number of transmitting antennas and the number of receiving antennas are increased at the same time, the channel capacity may be raised to transmit more data. For example, when the number of antennas is increased to 10, it is possible to secure a channel capacity ten times larger than in a current single antenna system, even though the same frequency band is used.

In the 4G LTE-advanced technology, 8 antennas are used. According to the current pre-5G technology, a product having 64 or 128 antennas mounted therein is being developed. When the 5G technology is commercialized, it is expected that base station equipment with much more antennas will be used. This technology is referred to as massive MIMO. Currently, cells are operated in a 2D manner. However, when the massive MIMO technology is introduced, 3D-beamforming becomes possible. Thus, the massive MIMO technology is also referred to as FD (Full Dimension)-MIMO.

According to the massive MIMO technology, the numbers of transceivers and filters are increased with the increase in number of antennas. As of 2014, 200,000 or more base stations are installed in Korea. That is, there is a need for a cavity filter structure which is easily mounted while minimizing a mounting space. Furthermore, there is a need for an RF signal line connecting structure which provides the same filter characteristic even after individually tuned cavity filters are mounted in antennas.

An RF filter having a cavity structure includes a resonator provided in a box structure formed of a metallic conductor, the resonator being configured as a resonant bar or the like. Thus, the RF filter has only a natural frequency of electromagnetic field to transmit only a specific frequency, e.g. an ultra-high frequency, through resonance. A band pass filter with such a cavity structure has a low insertion loss and high power. Thus, the band pass filter is utilized in various manners as a filter for a mobile communication base station antenna.

DISCLOSURE Technical Problem

An object of the present invention is to provide a cavity filter which has a slimmer and more compact structure and includes an RF connector embedded in a filter body in a thickness direction thereof, and a connecting structure included therein.

Another object of the present invention is to provide a cavity filter which is assembled through an assembly method capable of minimizing the accumulation amount of assembly tolerance which occurs when a plurality of filters are assembled, and has an RF signal connection structure that can facilitate mounting and uniformly maintain the frequency characteristics of the filters, and a connecting structure included therein.

Still another object of the present disclosure is to provide a cavity filter which can prevent a signal loss by applying lateral tension while allowing a relative motion in the case of a separable RF pin, and a connecting structure therein.

Yet another object of the present disclosure is to provide a cavity filter which can maintain a constant contact area between two members to be electrically connected to each other, while absorbing assembly tolerance between the two members, and be installed through a clear and simple method, and a connecting structure included therein.

The technical problems of the present disclosure are not limited to the above-described technical problems, and other technical problems which are not mentioned can be clearly understood by the person skilled in the art from the following descriptions.

Technical Solution

In one general aspect, a cavity filter includes: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein the terminal portion is divided into a first side terminal contacted with the electrode pad and a second side terminal connected to the RF signal connecting portion, and absorbs the assembly tolerance existing in a terminal insertion port, in which the terminal portion is provided, through an elastic member provided between the first side terminal and the second side terminal.

The cavity filter may further include a dielectric body inserted into the terminal insertion port so as to cover the outside of the terminal portion.

The first side terminal of the terminal portion may be disposed in the terminal insertion port and moved with the dielectric body by an assembly force provided by an assembler, the second side terminal of the terminal portion may be connected to the RF signal connecting portion, and any one of the first side terminal and the second side terminal may be housed in the other so as to overlap the other by a predetermined length.

Any one of the first side terminal and the second side terminal may have a plurality of tension cut portions elongated in a top-to-bottom direction.

The tension cut portions may be provided in the first side terminal, and an upper end portion of the second side terminal may be housed in a lower end portion of the first side terminal.

The tension cut portions may be provided in the second side terminal, and a lower end portion of the first side terminal may be housed in an upper end portion of the second side terminal.

The dielectric body may support the outer circumferential surface of the first side terminal or the second side terminal having the plurality of tension cut portions formed therein.

The cavity filter may further include a reinforcement plate configured to reinforce the RF signal connecting portion provided in the terminal insertion port.

The reinforcement plate may be fixed to an insertion slot support portion protruding toward the terminal insertion port, as a part of a filter body.

The reinforcement plate may have a terminal through-hole through which the terminal portion passes, and any one of the first side terminal and the second side terminal, which passes through the terminal through-hole, may have a larger diameter than the terminal through-hole so as to be locked to the reinforcement plate.

The second side terminal may have an elastic ring installation groove formed on the outer surface thereof, and at least one elastic ring may be positioned in the elastic ring installation groove.

Two or more elastic rings may be vertically stacked in the elastic ring installation groove.

The elastic member may be provided as an elastic spring which elastically supports the first side terminal housed in the second side terminal.

The elastic member may be provided as a bar spring including a support ring which is supported by the top surface of the second side terminal and a pair of support bars which protrude from the support ring and upwardly inclined in directions crossing each other so as to support the first side terminal.

The second side terminal of the terminal portion may be soldered and fixed to a solder hole formed in a plate extended from the RF signal connecting portion.

In another general aspect, a connecting structure includes: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein the terminal portion is divided into first side terminal contacted with the electrode pad and the second side terminal connected to the RF signal connecting portion, and absorbs assembly tolerance existing in a terminal insertion port, in which the terminal portion is provided, through an elastic member provided between the first side terminal and the second side terminal.

Advantageous Effects

In accordance with the embodiments of the present disclosure, the cavity filter may have a slimmer and more compact structure because the RF connector is embedded in the filter body in the thickness direction thereof, be assembled through an assembly method capable of minimizing the accumulation amount of assembly tolerance which occurs when a plurality of filters are assembled, facilitate the RF signal connection structure to be easily mounted and uniformly maintain the frequency characteristics of the filters, and provide stable connection by applying lateral tension while allowing a relative motion, thereby preventing degradation in antenna performance.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram schematically illustrating a stacked structure of a massive MIMO antenna.

FIG. 2 is a cross-sectional view illustrating that a cavity filter in accordance with an embodiment of the present disclosure is stacked between an antenna board and a control board.

FIG. 3 is a plan perspective view of the structure of the cavity filter in accordance with the embodiment of the present disclosure, when seen from the bottom.

FIG. 4 is an exploded perspective view illustrating some components of a cavity filter in accordance with a first embodiment of the present disclosure.

FIG. 5 is a cross-sectional view illustrating the cavity filter in accordance with the first embodiment of the present disclosure.

FIG. 6 is a perspective view illustrating a terminal portion among components of FIG. 4.

FIG. 7 is an exploded perspective view illustrating a cavity filter in accordance with a second embodiment of the present disclosure.

FIG. 8 is a cross-sectional view illustrating the cavity filter in accordance with the second embodiment of the present disclosure.

FIG. 9 is a perspective view illustrating a terminal portion among components of FIG. 7.

FIG. 10 is an exploded perspective view illustrating a cavity filter in accordance with a third embodiment of the present disclosure.

FIG. 11 is a cross-sectional view illustrating the cavity filter in accordance with the third embodiment of the present disclosure.

FIG. 12 is a perspective view illustrating a terminal portion among components of FIG. 10.

FIG. 13 is an exploded perspective view illustrating a cavity filter in accordance with a fourth embodiment of the present disclosure.

FIG. 14 is a cross-sectional view illustrating the cavity filter in accordance with the fourth embodiment of the present disclosure.

FIG. 15 is a perspective view illustrating a terminal portion among components of FIG. 13.

FIG. 16 is an exploded perspective view illustrating a cavity filter in accordance with a fifth embodiment of the present disclosure.

FIG. 17 is a cross-sectional view illustrating the cavity filter in accordance with the fifth embodiment of the present disclosure.

FIG. 18 is a perspective view illustrating a terminal portion among the components of FIG. 16.

FIG. 19 is an exploded perspective view illustrating a cavity filter in accordance with a sixth embodiment of the present disclosure.

FIG. 20 is a cross-sectional view illustrating the cavity filter in accordance with the sixth embodiment of the present disclosure.

FIG. 21 is a perspective view illustrating a terminal portion among components of FIG. 19.

FIG. 22 is an exploded perspective view illustrating a cavity filter in accordance with a seventh embodiment of the present disclosure.

FIG. 23 is a cross-sectional view illustrating the cavity filter in accordance with the seventh embodiment of the present disclosure.

FIG. 24 is a perspective view illustrating a terminal portion among components of FIG. 22.

FIG. 25 is an exploded perspective view illustrating a cavity filter in accordance with an eighth embodiment of the present disclosure.

FIG. 26 is a cross-sectional view illustrating the cavity filter in accordance with the eighth embodiment of the present disclosure.

FIG. 27 is a perspective view illustrating a terminal portion among components of FIG. 25.

FIG. 28 is a cross-sectional view illustrating a connecting structure in accordance with an embodiment of the present disclosure.

BEST MODE

Hereafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, when components in each of the drawings are denoted by reference numerals, the same components are represented by like reference numerals, even though the components are displayed on different drawings. Furthermore, when it is determined that the detailed descriptions of publicly known components or functions related to the present disclosure disturb understandings of the embodiments of the present disclosure, the detailed descriptions thereof will be omitted herein.

When the components of the embodiments of the present disclosure are described, the terms such as first, second, A, B, (a) and (b) may be used. Each of such terms is only used to distinguish the corresponding component from other components, and the nature or order of the corresponding component is not limited by the term. Furthermore, all terms used herein, which include technical or scientific terms, may have the same meanings as those understood by those skilled in the art to which the present disclosure pertains, as long as the terms are not differently defined. The terms defined in a generally used dictionary should be analyzed to have meanings which coincide with contextual meanings in the related art. As long as the terms are not clearly defined in this specification, the terms are not analyzed as ideal or excessively formal meanings.

FIG. 1 is a diagram schematically illustrating a stacked structure of a massive MIMO antenna.

FIG. 1 only illustrates an exemplary exterior of an antenna device 1 in which an antenna assembly including a cavity filter in accordance with an embodiment of the present disclosure is embedded, and does not limit the exterior of the antenna device 1 when components are actually stacked.

The antenna device 1 includes a housing 2 having a heat sink formed therein and a radome 3 coupled to the housing 2. Between the housing 2 and the radome 3, an antenna assembly may be embedded.

A PSU (Power Supply Unit) 4 is coupled to the bottom of the housing 2 through a docking structure, for example, and provides operation power for operating communication parts included in the antenna assembly.

Typically, the antenna assembly has a structure in which an equal number of cavity filters 7 to the number of antennas are disposed on a rear surface of an antenna board 5 having a plurality of antenna elements 6 arranged on a front surface thereof, and a related PCB 8 is subsequently stacked. The cavity filters 7 may be thoroughly tuned and verified to individually have frequency characteristics suitable for the specification, and prepared before mounted on the antenna board 5. Such a tuning and verifying process may be rapidly performed in an environment with the same characteristics as the mounting state.

FIG. 2 is a cross-sectional view illustrating that a cavity filter in accordance with an embodiment of the present disclosure is stacked between an antenna board and a control board.

Referring to FIG. 2, a typical RF connector (see reference numeral 90 of FIG. 1) illustrated in FIG. 1 may be excluded, which makes it possible to provide an antenna structure having a lower height profile while facilitating the connection.

Furthermore, an RF connecting portion is disposed on either surface of the cavity filter in the height direction thereof, and connected to the cavity filter 20 in accordance with the embodiment of the present disclosure. Although an outer member 8 configured as any one of an antenna board and a PCB board is vibrated or thermally deformed, the RF connection is equally maintained without a change in frequency characteristic.

FIG. 3 is a plan perspective view of the structure of the cavity filter in accordance with the embodiment of the present disclosure, when seen from the bottom.

Referring to FIG. 3, the cavity filter 20 in accordance with the embodiment of the present disclosure includes an RF signal connecting portion 31 (see reference numeral 31 of FIG. 4 and the following drawings), a first case (with no reference numeral) having a hollow space therein, a second case (with no reference numeral) covering the first case, a terminal portion (see reference numeral ‘40’ among numbers in the tens in FIG. 4 and the following drawings) formed on either side of the first case in the longitudinal direction thereof and disposed in the height direction of the cavity filter 20, and a filter module 30 including a plurality of assembly holes formed on both sides of the terminal portion 40. In FIG. 4 and the following drawings, the filter module will be represented by 30, except reference numerals in the hundreds, which are used to distinguish among embodiments. The terminal portion 40 electrically connects an electrode pad of the outer member 8 to the RF signal connecting portion 31 through a terminal insertion port 25 formed in the first case, the outer member 8 being configured as any one of an antenna board and a PCB board.

The integrated or separable configuration of the terminal portion 40 in the cavity filter 20 in accordance with the embodiment of the present disclosure may be implemented as various embodiments depending on a shape for applying lateral tension and a specific configuration for absorbing assembly tolerance, as will be described below.

More specifically, the cavity filter 20 may be divided into an integrated filter and a separable filter. The integrated filter may be formed as one body in which one end connected to (contacted with) the electrode pad of the outer member 8 provided as any one of an antenna board and a PCB board is connected to the other end connected to (contacted with) the RF signal connecting portion 31, and the separable filter may have a structure in which one end and the other end of the terminal portion 40 are separated from each other at a certain position.

In the case of the integrated filter, the terminal portion 40 is provided as an electrical body whose part is elastically deformed when a predetermined assembly force is supplied, in order to remove assembly tolerance. However, the integrated filter having the terminal portion 40 integrated therewith does not require a separate shape design for applying lateral tension, because it is not predicted that an electric flow from one end to the other end thereof will be disconnected.

On the contrary, the separable filter includes a separate elastic member 80 to remove assembly tolerance. Specifically, the whole length of the terminal portion 40 can be decreased while the predetermined assembly force moves a first side terminal 50 and a second side terminal 60, which are separated from each other, to overlap each other, and restored to the original state when the assembly force is removed. However, since the first side terminal 50 and the second side terminal 60 of the terminal portion are separated from each other, it is feared that an electric flow will be disconnected when the first side terminal 50 and the second side terminal 60 are moved to overlap each other. Therefore, any one of the first side terminal 50 and the second side terminal 60 may be provided as an elastic body, or a separate shape change for applying lateral tension may be essentially required.

The term ‘lateral tension’ may be defined as a force which any one of the first side terminal 50 and the second side terminal 60 transfers to the other in a direction different from the longitudinal direction, in order to prevent the disconnection of the electric flow between the first side terminal 50 and the second side terminal 60, as described above.

The antenna device is characterized in that, when the shape change in the terminal portion 40 is designed, impedance matching design in the terminal insertion port 25 needs to be paralleled. However, the embodiments of the cavity filter 20 in accordance with the present disclosure will be described under the supposition that impedance matching is achieved in the terminal insertion port 25. Among the components of the embodiments of the cavity filter in accordance with the present disclosure, which will be described with reference to FIG. 4 and the following drawings, the external of a reinforcement plate or dielectric body inserted into the terminal insertion port 25 with the terminal portion 40 may have a different shape depending on impedance matching design.

FIG. 4 is an exploded perspective view illustrating some components of a cavity filter in accordance with a first embodiment of the present disclosure, FIG. 5 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 4, and FIG. 6 is a perspective view illustrating the terminal portion among the components of FIG. 4.

As illustrated in FIGS. 4 to 6, a cavity filter 20 in accordance with the first embodiment of the present disclosure includes an RF signal connecting portion 31 and a terminal portion 40. The RF signal connecting portion 31 is spaced part, by a predetermined distance, from an outer member 8 having an electrode pad (with no reference numeral) provided on one surface thereof. The terminal portion 40 can electrically connect the electrode pad of the outer member 8 to the RF signal connecting portion 31, and not only absorb assembly tolerance existing at the predetermined distance, but also prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion 31.

As illustrated in FIG. 2, the outer member 8 may be commonly referred to as any one of an antenna board having antenna elements arranged on the other surface thereof and a PCB board provided as one board on which a PA (Power Amplifier), a digital board and TX calibration are integrated.

Hereafter, as illustrated in FIG. 3, an exterior configuration constituting the embodiments of the cavity filter 20 in accordance with the present disclosure is not divided into first and second cases, but commonly referred to as a filter body 21 having a terminal insertion port 25 formed therein.

As illustrated in FIGS. 4 and 5, the terminal insertion port 25 of the filter body 21 may be provided as a hollow space. The terminal insertion port 25 may be formed in different shapes depending on impedance matching design applied to a plurality of embodiments which will be described below.

The filter body 21 may have a washer installation portion 27 formed as a groove on one surface thereof, on which first side terminal 50 of the terminal portion 40 to be described below is provided. The washer installation portion 27 may be formed as a groove to have a larger inner diameter than the terminal insertion port 25. Thus, the outer edge of a star washer 90 to be described below may be locked to the washer installation portion 27 such that the star washer 90 is prevented from being separated upward.

The cavity filter 20 in accordance with the first embodiment of the present disclosure may further include the star washer 90 fixedly installed on the washer installation portion 27.

The following descriptions will be based on the supposition that the star washer 90 is commonly provided in all the embodiments of the present disclosure, which will be described below, as well as the first embodiment of the present disclosure. Therefore, it should be understood that, although the star washer 90 is not described in detail in the embodiments other than the first embodiment, the star washer 90 is included in the embodiments.

The star washer 90 may have a fixed edge 91 formed in a ring shape and fixed to the washer installation portion 27, and include a plurality of support pieces 92 which are upwardly inclined from the fixed edge 91 toward the center of the electrode pad of the outer member 8 configured as any one of an antenna board and a PCB board.

When the embodiments of the cavity filter 20 in accordance with the present disclosure are assembled to the outer member 8 configured as any one of an antenna board and a PCB board by an assembler, the star washer 90 may apply an elastic force to a fastening force by a fastening member (not illustrated) through the above-described assembly hole, while the plurality of support pieces 92 are supported on one surface of the outer member 8 configured as any one of an antenna board and a PCB board.

The applying of the elastic force through the plurality of support pieces 92 may make it possible to uniformly maintain a contact area with the electrode pad of the terminal portion 40.

Furthermore, the ring-shaped fixed edge 91 of the star washer 90 may be provided to cover the outside of the terminal portion 40 which is provided to transfer an electric signal, and serve as a kind of ground terminal.

Furthermore, the star washer 90 serves to remove assembly tolerance existing between the outer members 8, each configured as any one of an antenna board and a PCB board, in the embodiments of the cavity filter 20 in accordance with the present disclosure.

As described below, however, the assembly tolerance absorbed by the star washer 90 exists in the terminal insertion port 25, and is distinguished from assembly tolerance absorbed by the terminal portion 40. That is, the cavity filter in accordance with the embodiments of the present disclosure may be designed to absorb overall assembly tolerances at two or more locations through separate members during a single assembly process, and thus coupled more stably.

As illustrated in FIGS. 4 to 6, the terminal portion in the cavity filter 20 in accordance with the first embodiment of the present disclosure may include the first side terminal 50 and the second side terminal 60. The first side terminal 50 may be contacted with the electrode pad of the outer member 8, and the second side terminal 60 may be fixed to a solder hole 32 formed in a portion extended as the RF signal connecting portion 31 in a plate shape.

Any one of the first side terminal 50 and the second side terminal 60 may be inserted into the other, such that parts of end portions of the respective terminals overlap each other by a predetermined length during an assembly process.

The cavity filter 20 in accordance with the first embodiment of the present disclosure may have a structure in which the bottom of the first side terminal 50 is inserted into the top of the second side terminal 60 in the drawings (see FIGS. 4 to 6). For this structure, an upper end portion 61 of the second side terminal 60 may be provided in a hollow pipe shape such that a lower end portion of the first side terminal 50 is partially inserted into the upper end portion 61 of the second side terminal 60.

When the terminal portion 40 provided as the first side terminal 50 and the second side terminal 60 is installed in the terminal insertion port 25, a dielectric body 70 may be inserted to cover the outside of the terminal portion 40, for impedance matching in the terminal insertion port 25. The dielectric body 70 may be formed of Teflon. However, the material of the dielectric body 70 is not limited to Teflon, but can be replaced with any materials as long as the materials have a dielectric constant at which impedance matching in the terminal insertion port can be achieved.

The dielectric body 70 can be formed as one body with the first side terminal 50 of the terminal portion 40 through injection molding. However, the dielectric body 70 may be separately formed to have a terminal through-hole 71 into which the above-described terminal portion 40 is inserted, and inserted and assembled into the terminal insertion port 25. As illustrated in FIG. 5, the dielectric body 70 may be inserted into the terminal insertion port 25 so as to be locked to an insertion slot support portion 28 provided in the terminal insertion port 25.

The smaller the contact area of a contact portion 53 of the first side terminal 50, which is contacted with the outer member 8 provided as any one of an antenna board and a PCB board, the better. Therefore, as illustrated in FIGS. 4 to 6, the contact portion 53 serving as a leading end of the first side terminal 50 may be formed in a hemispherical shape with a predetermined contact area.

When an assembler provides an assembling force through an operation of bringing the first side terminal 50 into contact with the electrode pad of the outer member 8 through the contact portion 53 serving as the leading end thereof, the first side terminal 50 may be moved in a top-to-bottom direction in the drawings, while guided through the terminal through-hole 71 of the dielectric body 70 disposed in the terminal insertion port 25. The first side terminal 50 may be provided as a metallic rod through which electricity flows.

Furthermore, the upper end portion 61 of the second side terminal 60, into which the lower end portion of the first side terminal 50 is partially inserted, may have a plurality of tension cut portions 64 elongated in the top-to-bottom direction. The tension cut portions 64 may be formed to divide the upper end portion 61 of the second side terminal 60, formed in a hollow pipe shape, into a plurality of portions.

The tension cut portions 64 serve to apply the above-described lateral tension through an operation of pressing the upper end portion 61 of the second side terminal 60 against the outer circumference of the lower end portion of the first side terminal 50 housed in the upper end portion 61.

The dielectric body 70 is provided to support the outer circumferential surface of the upper end portion 61 of the second side terminal 60, where the tension cut portions 64 are formed, toward the inside. Thus, the inner surfaces of the upper end portions 61 of the second side terminal 60, divided by the tension cut portions 64, are always contacted with the outer circumferential surface of the first side terminal 50 housed in the second side terminal 60.

When the tension cut portions 64 are formed to divide the upper end portion 61 of the second side terminal 60 in the plurality of portions, the tips of the upper end portions 61 of the second side terminal 60 may be inclined at a predetermined angle toward the center of the second side terminal 60. At this time, the tips of the upper end portions 61 of the second side terminal 60 may be inclined to have such a size that at least the lower end portion of the first side terminal 50 is housed in the upper end portions 61 of the second side terminal 60 formed in a hollow pipe shape.

The applying of the lateral tension through the tension cut portions 64 may make it possible to prevent disconnection of the electric flow between the two separated terminals of the terminal portion 40.

The cavity filter 20 in accordance with the first embodiment of the present disclosure may include one or more elastic members 80 which are disposed in the upper end portion 61 of the second side terminal 60 formed in a hollow pipe shape and elastically supports the first side terminal 50.

In the cavity filter 20 in accordance with the first embodiment of the present disclosure, the one or more elastic members 80 serve to elastically support the first side terminal 50 toward the outer member 8 configured as any one of an antenna board and a PCB board, thereby absorbing assembly tolerance existing in the terminal insertion port 25.

As illustrated in FIGS. 4 to 6, the elastic member 80 may be provided as a plurality of elastic beads which are formed to have a diameter corresponding to the inner diameter of the second side terminal 60 formed in a hollow pipe shape, and stacked in the top-to-bottom direction.

Although not specifically illustrated, when the contact portion 53 serving as the leading end of the first side terminal 50 of the terminal portion 40 is closely assembled to the electrode pad of the outer member 8, the elastic members 80 are compressed in the upper end portion 61 of the second side terminal 60 formed in a hollow pipe shape, while absorbing assembly tolerance existing in the terminal insertion port 25 as described above, and then provide an elastic force to continuously bring the contact portion 53 of the first side terminal 50 into contact with the electrode pad.

As illustrated in FIG. 5, the first side terminal 50 may be formed to such a height that the contact portion 53 protrudes further than the support pieces 92 of the star washer 90, when no assembly force is provided by an assembler.

Hereafter, an assembly tolerance absorption process and a lateral tension application process during an assembly process of the cavity filter 20 in accordance with the first embodiment of the present disclosure, which has the above-described configuration, will be described with reference to the accompanying drawings (specifically, FIG. 5).

First, as illustrated in FIG. 5, a predetermined fastening force is transferred to the cavity filter 20 in accordance with the first embodiment of the present disclosure through an operation of bringing the cavity filter 20 into contact with one surface of the outer member 8 provided as any one of an antenna board and a PCB board and having an electrode pad provided thereon, and then fastening a fastening member (not illustrated) to an assembly hole. However, the cavity filter 20 does not necessarily need to be contacted with one surface of the outer member 8 configured as any one of an antenna board and a PCB board. On the contrary, the one surface of the outer member 8 configured as any one of an antenna board and a PCB board may be contacted with the cavity filters 20 arranged at predetermined intervals, in order to transfer an assembly force.

Then, as illustrated in FIG. 5, the distance between the outer member 8 provided as any one of an antenna board and a PCB board and the cavity filter 20 in accordance with the first embodiment of the present disclosure may be decreased. Simultaneously, the support pieces 92 of the star washer 90 may be deformed by the above-described fastening force to primarily absorb assembly tolerance existing between the cavity filter 20 in accordance with the first embodiment of the present disclosure and the outer member 8 provided as any one of an antenna board and a PCB board.

Simultaneously, the first side terminal 50 of the terminal portion 40 is pressed by the one surface of the outer member 8 provided as any one of an antenna board and a PCB board, and moved by a predetermined distance toward the second side terminal 60 while guided through the terminal through-hole 71 of the dielectric body 70 inserted into the terminal insertion port 25. At this time, the elastic members 80 such as a plurality of elastic beads, which are stacked in the upper end portion 61 of the second side terminal 60, are compressed to secondarily absorb assembly tolerance existing in the terminal insertion port of the cavity filter 20 in accordance with the first embodiment of the present disclosure.

Furthermore, since the upper end portion 61 of the second side terminal 60 applies lateral tension to the outer circumferential surface of the lower end portion of the first side terminal 50, inserted into the second side terminal 60 formed in a hollow pipe shape, through the tension cut portions 64, it is possible to prevent disconnection of the electric flow between the first side terminal 50 and the second side terminal 60, thereby preventing degradation in signal performance of the cavity filter 20 in accordance with the first embodiment of the present disclosure.

FIG. 7 is an exploded perspective view illustrating some components of a cavity filter in accordance with a second embodiment of the present disclosure, FIG. 8 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 7, and FIG. 9 is a perspective view illustrating the terminal portion among the components of FIG. 7.

As illustrated in FIGS. 7 to 9, a cavity filter 20 in accordance with the second embodiment of the present disclosure includes an RF signal connecting portion 31, a terminal portion 140 including a first side terminal 150 and a second side terminal 160, a dielectric body 170 inserted into a terminal insertion port 25 so as to cover the outside of the terminal portion 140, and a reinforcement plate 195 for reinforcing the RF signal connecting portion 31.

The RF signal connecting portion 31, the terminal portion 140, the dielectric body 170 and sub components thereof are configured in the same manner as those of the cavity filter 20 in accordance with the first embodiment of the present disclosure, which has been already described, unless specifically described below. Thus, the detailed descriptions thereof may be replaced with those of the first embodiment. The following descriptions will be focused on differences from those of the first embodiment.

As illustrated in FIGS. 8 and 9, the reinforcement plate 195 may have a terminal through-hole 171 through which the second side terminal 160 passes, and the second side terminal 160 may be fixed to the terminal through-hole 171 of the reinforcement plate 195. The second side terminal 160 may have a locking end 163 which has a larger diameter than the terminal through-hole 171 so as to be locked to the top surface of the reinforcement plate 195 through the terminal through-hole 171 of the reinforcement plate 195.

Although not illustrated, the bottom surface of the edge of the reinforcement plate 195 may be supported by an insertion slot support portion 28 formed in the terminal insertion port 25.

The reinforcement plate 195 serves to restrict the dielectric body 170 from being moved downward with the first side terminal 150 by a frictional force with the first side terminal 150 which is moved downward by an assembly force provided by an assembler, thereby reinforcing the dielectric body 170.

Furthermore, the reinforcement plate 195 serves to restrict the downward movement of the second side terminal 160 through the locking end 163, thereby substantially reinforcing the RF signal connecting portion 31 to which a tail end 162 of the second side terminal 160 is soldered and fixed.

That is, in the cavity filter 20 in accordance with the first embodiment, an assembly force may be transferred to the RF signal connecting portion 31 while the second side terminal 160 is moved downward by the first side terminal 50 moved by an assembly force. However, the cavity filter 20 in accordance with the second embodiment may serve to indirectly reinforce the RF signal connecting portion 31 by restricting the downward movement of the second side terminal 160.

The structure in which the tension cut portions 164 are formed in an upper end portion 161 of the second side terminal 160, the lower end portion of the first side terminal 150 is partially inserted into the upper end portion 161 of the second side terminal 160 formed in a hollow pipe shape, and the plurality of elastic beads are provided as the elastic members 180 between the first side terminal 150 and the second side terminal 160 is the same as the structure of the first embodiment. Thus, the detailed descriptions thereof will be omitted herein.

FIG. 10 is an exploded perspective view illustrating some components of a cavity filter in accordance with a third embodiment of the present disclosure, FIG. 11 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 10, and FIG. 12 is a perspective view illustrating the terminal portion among the components of FIG. 10.

As illustrated in FIGS. 10 to 12, a cavity filter 20 in accordance with the third embodiment of the present disclosure includes an RF signal connecting portion 31, a terminal portion 240 and a dielectric body 270.

Among the components of the cavity filter 20 in accordance with the third embodiment of the present disclosure, the RF signal connecting portion 31, the dielectric body 270 and sub components thereof are configured in the same manner as those of the cavity filters 20 in accordance with the first and second embodiments of the present disclosure, which has been already described, unless specifically described below. Thus, the detailed descriptions thereof may be replaced with those of the first and second embodiments.

However, the cavity filter 20 in accordance with the third embodiment of the present disclosure adopts the dielectric body 270 which is configured in the same manner as the dielectric body 70 of the cavity filter 20 in accordance with the first embodiment, but excludes the reinforcement plate 195 among the components of the cavity filter 20 in accordance with the second embodiment.

Among the components of the cavity filter 20 in accordance with the third embodiment of the present disclosure, the terminal portion 240 has a different structure from those of the first and second embodiments in that tension cut portions 254 are formed in a lower end portion 252 of first side terminal 250, and an upper end portion 261 of the second side terminal 260 is housed in the lower end portion 252 of the first side terminal 250 formed in a hollow pipe shape.

The first side terminal 250 may further include a separation prevention rib 255 protruding outwardly from an outer circumferential surface thereof, corresponding to the tops of the tension cut portions 254.

The separation prevention rib 255 of the first side terminal 250 is locked to the inside of a terminal through-hole 271 of the dielectric body 270, and prevents the first side terminal 250 from being separated to the outside by elastic forces of a plurality of elastic beads 280 interposed between the first side terminal 250 and the second side terminal 260. The outside indicates the direction in which an outer member 8 provided as any one of an antenna board and a PCB board and having an electrode pad provided thereon is provided.

In addition, the cavity filter 20 in accordance with the third embodiment has the same configuration as the cavity filter 20 in accordance with the first embodiment in that the dielectric body 270 supports the outer surfaces of the tension cut portions 254 of the first side terminal 250, and a lower end portion 262 of the second side terminal 260 is directly soldered and fixed to the RF signal connecting portion 31 without a separate reinforcement plate.

FIG. 13 is an exploded perspective view illustrating some components of a cavity filter in accordance with a fourth embodiment of the present disclosure, FIG. 14 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 13, and FIG. 15 is a perspective view illustrating the terminal portion among the components of FIG. 13.

As illustrated in FIGS. 13 to 15, a cavity filter 20 in accordance with the fourth embodiment of the present disclosure includes an RF signal connecting portion 31, a terminal portion 340, a dielectric body 370 and a reinforcement plate 395.

Since the reinforcement plate 395 performs the same function as the reinforcement plate 195 in the cavity filter 20 in accordance with the second embodiment, the detailed descriptions thereof will be omitted herein.

Furthermore, since the terminal portion 340 is configured in the same manner as that of the cavity filter in accordance with the third embodiment, the descriptions thereof may be replaced with those of the third embodiment.

In addition, the cavity filter 20 in accordance with the fourth embodiment may include all the other components of the cavity filter 20 in accordance with the second embodiment.

FIG. 16 is an exploded perspective view illustrating some components of a cavity filter in accordance with a fifth embodiment of the present disclosure, FIG. 17 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 16, and FIG. 18 is a perspective view illustrating the terminal portion among the components of FIG. 16.

As illustrated in FIGS. 16 to 18, a cavity filter 20 in accordance with the fifth embodiment of the present disclosure includes an RF signal connecting portion 31, a terminal portion 440, a dielectric body 470 and a reinforcement plate 495.

Since the reinforcement plate 495 performs the same function as the reinforcement plates 195 and 395 in the cavity filters 20 in accordance with the second and fourth embodiments, the detailed descriptions thereof will be omitted herein.

Furthermore, since the terminal portion 440 is configured in the same manner as those of the cavity filters 20 in accordance with the third and fourth embodiments, the descriptions thereof may be replaced with those of the third and fourth embodiments.

As illustrated in FIGS. 16 to 18, however, an elastic member 480 interposed between a first side terminal 450 and a second side terminal 460 in the cavity filter 20 in accordance with the fifth embodiment of the present disclosure may be provided as an elastic spring, compared to those of the cavity filters 20 in accordance with the first to fourth embodiments.

In addition, the cavity filter 20 in accordance with the fifth embodiment may include all the other components of the cavity filter 20 in accordance with the fourth embodiment.

FIG. 19 is an exploded perspective view illustrating some components of a cavity filter in accordance with a sixth embodiment of the present disclosure, FIG. 20 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 19, and FIG. 21 is a perspective view illustrating the terminal portion among the components of FIG. 19.

As illustrated in FIGS. 19 to 21, a cavity filter 20 in accordance with the sixth embodiment of the present disclosure includes an RF signal connecting portion 31, a terminal portion 540 including a first side terminal 550 and a second side terminal 560, and a reinforcement plate 595.

Among the components of the cavity filter 20 in accordance with the sixth embodiment of the present disclosure, the RF signal connecting portion 31, the terminal portion 540, the reinforcement plate 595 and sub components thereof have the same configurations and functions as those of the cavity filters 20 in accordance with the first to fifth embodiments of the present disclosure, which have been already described, unless specifically described below. Thus, the detailed descriptions thereof may be replaced with those of the first to fifth embodiments.

However, as illustrated in FIGS. 19 to 21, the terminal portion 540 among the components of the cavity filter 20 in accordance with the sixth embodiment of the present disclosure has the same configuration as those of the cavity filters 20 in accordance with the first and second embodiments. That is, tension cut portions 564 may be formed in an upper end portion 561 of the second side terminal 560, such that a lower end portion of the first side terminal 550 is partially housed in the upper end portion 561 of the second side terminal 560 provided as a hollow pipe.

Furthermore, the first side terminal 550 in the cavity filter 20 in accordance with the sixth embodiment of the present disclosure may be formed in a rod shape which is elongated in the top-to-bottom direction, and elastically supported by an elastic spring provided as an elastic member 557 in the second side terminal 560.

Furthermore, the first side terminal 550 may have a locking rib 554 formed on the outer circumferential surface thereof, the locking rib 554 being locked to the inside of the second side terminal 560 so as to prevent the first side terminal 550 from being separated to the outside by the elastic member 557. The locking rib 554 may be provided as a hook which is not locked when the first side terminal 550 is inserted into the second side terminal 560, but locked to a locking stepped portion 567 formed in the second side terminal 560 after the locking rib 554 is moved past the locking stepped portion 567.

In the cavity filter 20 in accordance with the sixth embodiment of the present disclosure, the second side terminal 560 may have an elastic ring installation groove 565 formed on the outer circumferential surface thereof, and a plurality of elastic rings 580 may be vertically stacked in the elastic ring installation groove 565. In the cavity filter 20 in accordance with the sixth embodiment of the present disclosure, two elastic rings 580 a and 580 b are vertically stacked as the elastic rings 580. However, the number of the elastic rings is not limited thereto.

The cavity filter 20 in accordance with the sixth embodiment of the present disclosure excludes a dielectric body, but applies lateral tension by pressing the outer circumferential surface of the second side terminal 560 with the tension cut portions 564 through the elastic rings 580, thereby preventing disconnection of the electric flow between the second side terminal 560 and the outer circumferential surface of the first side terminal 550 moved in the top-to-bottom direction inside the second side terminal 560.

The cavity filter 20 in accordance with the sixth embodiment of the present disclosure is supported by an insertion slot support portion 28 formed in a terminal insertion port 25, and the reinforcement plate 595 having a terminal through-hole 597 through which the second side terminal 560 of the terminal portion 540 passes serves to reinforce the RF signal connecting portion 31 to which a lower end portion 562 of the second side terminal 560 is soldered and fixed.

As such, in the cavity filter 20 in accordance with the sixth embodiment of the present disclosure, the elastic member 557 provided as an elastic spring may be interposed between the first side terminal 550 and the second side terminal 560, and elastically support the first side terminal 550 toward the electrode pad provided on the outer member 8 provided as any one of an antenna board and a PCB board in response to an assembly force provided by an assembler, thereby secondarily absorbing assembly tolerance existing in the terminal insertion port 25.

FIG. 22 is an exploded perspective view illustrating some components of a cavity filter in accordance with a seventh embodiment of the present disclosure, FIG. 23 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 22, and FIG. 24 is a perspective view illustrating the terminal portion among the components of FIG. 22.

As illustrated in FIGS. 22 to 24, a cavity filter 20 in accordance with the seventh embodiment of the present disclosure includes a terminal portion 640 and dielectric bodies 670 a and 670 b disposed in a terminal insertion port 25.

The dielectric bodies 670 a and 670 b may have a shape for impedance matching in the terminal insertion port 25. As illustrated in FIG. 22, the dielectric bodies 670 a and 670 b may include upper and lower dielectric bodies 670 a and 670 b having terminal through-holes 671 a and 671 b through which upper and lower end portions of the second side terminal 660 of the terminal portion 640, which will be described below, pass, respectively.

As illustrated in FIGS. 22 and 24, the cavity filter 20 in accordance with the seventh embodiment of the present disclosure may be disposed in the terminal insertion port 25, and include a main terminal housing 29 formed in a hollow pipe shape and a sub terminal housing 29′ disposed over the main terminal housing 29 so as to be spaced apart from the main terminal housing 29.

Although not specifically illustrated in the drawings, the terminal insertion port 25 may have a shape corresponding to the exterior shapes of the main terminal housing 29 and the sub terminal housing 29′.

The second side terminal 660 may be disposed vertically through the main terminal housing 29, and disposed through the terminal through-holes 671 a and 671 b of the upper and lower dielectric bodies 670 a and 670 b provided in the main terminal housing 29.

Furthermore, a part of the upper end portion of the second side terminal 660 disposed through the main terminal housing 29 may be inserted, by a predetermined distance, into the sub terminal housing 29′. In the sub terminal housing 29′, a locking end 652 formed at the bottom of the first side terminal 650 may be installed to prevent the first side terminal 650 from being separated to the outside, and an elastic member 680 may be interposed between the first side terminal 650 and the second side terminal 660.

The first side terminal 650 may include a contact portion 651 and a contact plate 652. The contact portion 651 may be contacted with the electrode pad of an outer member 8 provided as any one of an antenna board and a PCB board, and the contact plate 652 may be formed to have a larger diameter than the outer diameter of the contact portion 651, and locked to the inside of the sub terminal housing 29′.

As illustrated in FIGS. 22 and 23, the elastic member 680 may be provided as a bar spring which includes a support ring 681 and a pair of support bars 682. The support ring 681 may be supported by the top surface of the second side terminal 660, and the pair of support bars 682 may protrude from the support ring 681 so as to be upward inclined in directions crossing each other, and support the bottom surface of the contact plate 652 of the first side terminal 650.

As illustrated in FIG. 23, the bar spring may absorb assembly tolerance existing in the terminal insertion port 25 while compressed and deformed by the first side terminal 650 which is pressed when an assembly force of an assembler is provided. Simultaneously, the bar spring may prevent disconnection of an electric flow even though separate tension cut portions are not provided, because the bar spring is formed of a conductive material through which a current may flow.

The lower end portion of the second side terminal 660 may be soldered to a solder hole 32 formed in the plate of the RF signal connecting portion 31 provided in the terminal insertion port 25.

In the cavity filter 20 in accordance with the seventh embodiment of the present disclosure, which has the above-described configuration, the first side terminal 650 of the terminal portion 640 may absorb assembly tolerance existing in the terminal insertion port 25 through an assembly force provided by an assembler, while elastically supported by the elastic member 680 in the sub terminal housing 29′.

FIG. 25 is an exploded perspective view illustrating some components of a cavity filter in accordance with an eighth embodiment of the present disclosure, FIG. 26 is a cross-sectional view illustrating that a terminal portion is inserted and installed into a terminal insertion port among the components of FIG. 25, and FIG. 27 is a perspective view illustrating the terminal portion among the components of FIG. 25.

As illustrated in FIGS. 25 to 27, a cavity filter 20 in accordance with the eighth embodiment of the present disclosure includes a terminal portion 740 and dielectric bodies 770 a and 770 b disposed in a terminal insertion port 25.

As illustrated in FIG. 26, the dielectric bodies 770 a and 770 b may each have a shape for impedance matching in the terminal insertion port 25, and include upper and lower dielectric bodies 770 a and 770 b having terminal through-holes 771 a and 771 b through which an upper end portion of the first side terminal 750 a and a lower end portion of the second side terminal 750 b in the terminal portion 740, which will be described below, pass, respectively.

As illustrated in FIGS. 25 to 27, the cavity filter 20 in accordance with the eighth embodiment of the present disclosure may include a terminal housing 29 disposed in the terminal insertion port 25 and formed in a hollow pipe shape and a transfer terminal 760 disposed in the center of the terminal housing 29 and elongated in the longitudinal direction thereof.

Although not specifically illustrated, the terminal insertion port 25 may be formed in a bar shape corresponding to the exterior shape of the terminal housing 29.

The transfer terminal 760 may have an upper end portion 761 and a lower end portion 762. The upper end portion 761 may be partially inserted into the terminal through-hole 771 a of the upper dielectric body 770 a, and the lower end portion 762 may be partially inserted into the terminal through-hole 771 b of the lower dielectric body 770 b.

As illustrated in FIGS. 25 and 26, the terminal portion 740 in the cavity filter 20 in accordance with the eighth embodiment of the present disclosure may include the first side terminal 750 a and the second side terminal 750 b. The first side terminal 750 a may be disposed in the terminal through-hole 771 a of the upper dielectric body 770 a, spaced apart from the upper end portion 761 of the transfer terminal 760, and fixedly locked so as not to be separated from the upper dielectric body 770 a. The second side terminal 750 b may be disposed in the terminal through-hole 771 b of the lower dielectric body 770 b, spaced apart from the lower end portion 762 of the transfer terminal 760, and fixedly locked so as not to be separated from the lower dielectric body 770 b.

Furthermore, the cavity filter 20 in accordance with the eighth embodiment of the present disclosure may include an upper elastic member 780 a and a lower elastic member 780 b, which are interposed between the upper dielectric body 770 a and the lower dielectric body 770 b. The upper elastic member 780 a may be interposed between the first side terminal 750 a and the upper end portion 761 of the transfer terminal 760, and the lower elastic member 780 b may be interposed between the second side terminal 750 b and the lower end portion 762 of the transfer terminal 760.

Both of the upper elastic member 780 a and the lower elastic member 780 b may be provided as springs.

As illustrated in FIG. 26, the upper elastic member 780 a and the lower elastic member 780 b may serve to absorb assembly tolerance existing in the terminal insertion port 25 while compressed and deformed by the first side terminal 750 a which is pressed when an assembly force of an assembler is provided.

As illustrated in FIG. 26, the cavity filter 20 in accordance with the eighth embodiment of the present disclosure may have tension cut portions 754 formed in a lower end portion 752 of the first side terminal 750 a and an upper end portion of the second side terminal 750 b, in which the upper and lower end portions 761 and 762 of the transfer terminal 760 are inserted and housed.

The outer circumferential surfaces of the tension cut portions 754 may be contacted with the upper dielectric body 770 a and the lower dielectric body 770 b and supported by the upper dielectric body 770 a and the lower dielectric body 770 b, thereby providing lateral tension. Therefore, it is possible to prevent disconnection of the electric flow between the first side terminal 750 a and the transfer terminal 760 and between the second side terminal 750 b and the transfer terminal 760.

FIG. 28 is a cross-sectional view illustrating a connecting structure in accordance with an embodiment of the present disclosure.

It has been described that each of the cavity filters in accordance with the various embodiments of the present disclosure, which have been described so far, is fabricated as one module and attached to one surface of the outer member 8 configured as any one of an antenna board and a PCB board. However, the embodiments of the present disclosure are not necessarily limited thereto. According to a modification illustrated in FIG. 28, the cavity filter may be implemented as a connection structure 1′ having the terminal portion 40 which is provided between the electrode pad provided on one surface of the outer member 8 and another connection member 31′, and makes an electric connection with the connection member 31′, regardless of whether the cavity filter is fabricated in the form of a module.

The above-described contents are only exemplary descriptions of the technical idea of the present disclosure, and those skilled in the art to which the present disclosure pertains may change and modify the present disclosure in various manners without departing from the essential properties of the present disclosure.

Therefore, the embodiments disclosed in the present disclosure do not limit but describe the technical idea of the present disclosure, and the scope of the technical idea of the present disclosure is not limited by the embodiments. The scope of the protection of the present disclosure should be construed by the following claims, and all technical ideas within a range equivalent to the claims should be construed as being included in the scope of rights of the present disclosure.

INDUSTRIAL APPLICABILITY

The present disclosure provides a cavity filter which can have a slimmer and more compact structure because an RF connector is embedded in the filter body in the thickness direction thereof, be assembled through an assembly method capable of minimizing the accumulation amount of assembly tolerance which occurs when a plurality of filters are assembled, facilitate the RF signal connection structure to be easily mounted and uniformly maintain the frequency characteristics of the filters, and provide stable connection by applying lateral tension while allowing a relative motion, thereby preventing degradation in antenna performance, and a connecting structure included therein. 

1. A cavity filter comprising: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein the terminal portion is divided into a first side terminal contacted with the electrode pad and a second side terminal connected to the RF signal connecting portion, and absorbs the assembly tolerance existing in a terminal insertion port, in which the terminal portion is provided, through an elastic member provided between the first side terminal and the second side terminal.
 2. The cavity filter of claim 1, further comprising a dielectric body inserted into the terminal insertion port so as to cover the outside of the terminal portion.
 3. The cavity filter of claim 2, wherein the first side terminal of the terminal portion is disposed in the terminal insertion port and moved with the dielectric body by an assembly force provided by an assembler, the second side terminal of the terminal portion is connected to the RF signal connecting portion, and any one of the first side terminal and the second side terminal is housed in the other so as to overlap the other by a predetermined length.
 4. The cavity filter of claim 2, wherein any one of the first side terminal and the second side terminal has a plurality of tension cut portions elongated in a top-to-bottom direction.
 5. The cavity filter of claim 4, wherein the tension cut portions are provided in the first side terminal, and an upper end portion of the second side terminal is housed in a lower end portion of the first side terminal.
 6. The cavity filter of claim 4, wherein the tension cut portions are provided in the second side terminal, and a lower end portion of the first side terminal is housed in an upper end portion of the second side terminal.
 7. The cavity filter of claim 5, wherein the dielectric body supports the outer circumferential surface of the first side terminal or the second side terminal having the plurality of tension cut portions formed therein.
 8. The cavity filter of claim 2, further comprising a reinforcement plate configured to reinforce the RF signal connecting portion provided in the terminal insertion port.
 9. The cavity filter of claim 8, wherein the reinforcement plate is fixed to an insertion slot support portion protruding toward the terminal insertion port, as a part of a filter body.
 10. The cavity filter of claim 8, wherein the reinforcement plate has a terminal through-hole through which the terminal portion passes, and any one of the first side terminal and the second side terminal, which passes through the terminal through-hole, has a larger diameter than the terminal through-hole so as to be locked to the reinforcement plate.
 11. The cavity filter of claim 10, wherein the second side terminal has an elastic ring installation groove formed on the outer surface thereof, and at least one elastic ring is positioned in the elastic ring installation groove.
 12. The cavity filter of claim 11, wherein two or more elastic rings are vertically stacked in the elastic ring installation groove.
 13. The cavity filter of claim 1, wherein the elastic member is provided as an elastic spring which elastically supports the first side terminal housed in the second side terminal.
 14. The cavity filter of claim 1, wherein the elastic member is provided as a bar spring including: a support ring which is supported by the top surface of the second side terminal; and a pair of support bars which protrude from the support ring and upwardly inclined in directions crossing each other so as to support the first side terminal.
 15. The cavity filter of claim 1, wherein the second side terminal of the terminal portion is soldered and fixed to a solder hole formed in a plate extended from the RF signal connecting portion.
 16. A connecting structure comprising: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein the terminal portion is divided into first side terminal contacted with the electrode pad and the second side terminal connected to the RF signal connecting portion, and absorbs assembly tolerance existing in a terminal insertion port, in which the terminal portion is provided, through an elastic member provided between the first side terminal and the second side terminal. 